Localization with non-synchronous emission and multipath transmission
AssigneeMassachusetts Institute of Technology
InventorsSwarun Suresh Kumar, Dina Katabi
Life of this patent
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Abstract
Directional characterization of a location of a target device makes use of multiple radio transmissions that are received from the target device. In some examples, each radio transmission is received at a first antenna at a fixed location, and is also received at a second moving antenna. The received transmissions are combined to determine the directional characterization, for example, as a distribution of power as a function of direction. In some examples, the received radio transmissions are processed to determine, for each of a plurality of directions of arrival of the radio transmissions, a most direct direction of arrival, for example, to distinguish a direct path from a reflected path from the target.
Claims20
A computer implemented method comprising:
- receiving a plurality of radio transmissions from a target device, each radio transmission of the plurality of radio transmissions being received at a first antenna at a fixed location, and received at an antenna at a location other than the fixed location of the first antenna such that the plurality of transmissions are received at a corresponding plurality of locations other than the fixed location of the first antenna;
- for each radio transmission of the plurality of radio transmissions, determining a first channel characteristic for a first radio channel from the target device to the first antenna, determining a second channel characteristic for a second radio channel from the target device to the antenna at the location other than the fixed location of the first antenna;
- combining the first channel characteristics and the second channel characteristics for the plurality of radio transmissions to determine a relative channel characteristic associated with each of the radio transmissions;
- and
- combining the relative radio characteristics and the corresponding locations other than the fixed location of the first antenna to determine a directional characterization of a location of the target device.
A localization system comprising:
- a plurality of antenna;
- a receiver coupled to the plurality of antennas for receiving radio signals acquired at the plurality of antennas
- and configured to process a plurality radio transmissions from a target radio device, including
- receiving the plurality of radio transmissions from a target device, each radio transmission of the plurality of radio transmissions being received at a first antenna at a fixed location, and received at an antenna at a location other than the fixed location of the first antenna such that the plurality of transmissions are received at a corresponding plurality of locations other than the fixed location of the first antenna,
- for each radio transmission of the plurality of radio transmissions, determining a first channel characteristic for a first radio channel from the target device to the first antenna, determining a second channel characteristic for a second radio channel from the target device to the antenna at the location other than the fixed location of the first antenna,
- combining the first channel characteristics and the second channel characteristics for the plurality of radio transmissions to determine a relative channel characteristic associated with each of the radio transmissions, and
- combining the relative radio characteristics and the corresponding locations other than the fixed location of the first antenna to determine a directional characterization of a location of the target device.
Dependencies are inferred from the claim text.